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NINE / Petal-2.24 / t / data / dummy_data.xml 
<body>
  <span petal:if="something" petal:content="somestuff">
    <a href="dummy">dummy</a>
  </span>
  <span petal:if="something" petal:replace="somestuff">
    <a href="dummy">dummy</a>
  </span>
</body>